Question

What is the percentage of the aggregate of fineness modulus 2.6 to be combined with coarse aggregate of fineness modulus 6.8 for obtaining combined aggregate of fineness modulus 5.4 ?

• A. 30%
• B. 40%
• C. 50%
• D. 60%

Answer 1

The correct option is C 50%

$\%fineaggregate=\frac{1.4}{2.8}\times 100=50$
Here we take 2.8 instead of (2.8+1.4) because the coarse aggregate of fineness 6.8 is involved in the coarse aggregate of fineness 2.8 or above.